{"id":"c2dc5e00-5126-54b6-9b8b-0846835ec314","stable_key":"aaa7baba-8689-56ab-ba1e-b71542bcb8e9:iod-clin-selenium-free-t4","predicate":"administration-accompanies-fall-in","statement":"Mean serum free T4 fell from 11.8 ± 6.7 to 8.4 ± 4.1 pmol/L after selenium treatment (P<0.01).","claim_class":"observational","status":"source_derived_draft","evidence_grade":"ungraded","direction":"negative","is_public":true,"mechanism_event_id":"f79a122e-0424-54c3-b921-68b324e00734","mechanism_event_label":"The free T4 measurement also fell after selenium was added.","subject":{"id":"9ae8a163-7137-5610-800b-82ef311e28b9","slug":"selenomethionine","display_name":"Selenomethionine (SeMet)","entity_type_key":"small_molecule"},"object":{"id":"5554c435-1309-5f33-bf47-6cf03cdff963","slug":"serum-free-t4-concentration","display_name":"Serum free thyroxine concentration","entity_type_key":"cellular_process"},"evidence_count":1,"mechanism_event":{"id":"f79a122e-0424-54c3-b921-68b324e00734","stable_key":"aaa7baba-8689-56ab-ba1e-b71542bcb8e9:iod-clin-selenium-free-t4-event","event_type":"observed_intervention","label":"The free T4 measurement also fell after selenium was added.","description":"Mean serum free T4 fell from 11.8 ± 6.7 to 8.4 ± 4.1 pmol/L after selenium treatment (P<0.01).","status":"provisional","compartment":null,"participants":[{"entity":{"id":"dc89d7e2-8f89-577b-838f-42bf5d8ec7c8","slug":"selenium","display_name":"Selenium","entity_type_key":"nutrient_element"},"role":"repleted nutrient","stoichiometry":null,"state_label":"","sequence_order":0,"notes":""},{"entity":{"id":"0e0ac6d1-3336-506a-9f69-5838ca1500ed","slug":"iodine","display_name":"Iodine","entity_type_key":"nutrient_element"},"role":"co-deficient nutrient","stoichiometry":null,"state_label":"","sequence_order":1,"notes":""},{"entity":{"id":"f2b25f38-ec94-57d0-a46d-dd0fee45f01e","slug":"thyroxine","display_name":"T4","entity_type_key":"small_molecule"},"role":"thyroid hormone substrate pool","stoichiometry":null,"state_label":"","sequence_order":2,"notes":""},{"entity":{"id":"9ae8a163-7137-5610-800b-82ef311e28b9","slug":"selenomethionine","display_name":"Selenomethionine (SeMet)","entity_type_key":"small_molecule"},"role":"subject","stoichiometry":null,"state_label":"","sequence_order":3,"notes":""},{"entity":{"id":"5554c435-1309-5f33-bf47-6cf03cdff963","slug":"serum-free-t4-concentration","display_name":"Serum free thyroxine concentration","entity_type_key":"cellular_process"},"role":"target","stoichiometry":null,"state_label":"","sequence_order":4,"notes":""}]},"contexts":[{"dimension":"availability_state","value_text":"nutrient_deficiency","comparator":null,"unit":null,"notes":"Imported condition classification; unverified.","entity":null},{"dimension":"cross_nutrient","value_text":"true","comparator":null,"unit":null,"notes":"","entity":null},{"dimension":"evidence_location","value_text":"Primary indexed abstract.","comparator":null,"unit":null,"notes":"","entity":null},{"dimension":"experimental_model","value_text":"Placebo-controlled selenium intervention in 52 schoolchildren from a region of severe iodine and selenium deficiency in northern Zaire","comparator":null,"unit":null,"notes":"","entity":null},{"dimension":"exposure","value_text":"Selenium 50 micrograms/day as selenomethionine or placebo for two months; no concurrent iodine-repletion regimen reported in the abstract.","comparator":null,"unit":null,"notes":"","entity":null},{"dimension":"limitations","value_text":"The abstract reports before/after changes in the selenium group; do not mistake these for adjusted between-group estimates. DIO1 restoration was a proposed explanation, not directly measured. Hormone changes do not themselves establish symptomatic deterioration or a universal order for supplement treatment.","comparator":null,"unit":null,"notes":"","entity":null},{"dimension":"nutrient_topic","value_text":"Iodine research collection; topical membership is not evidence of a direct dietary effect.","comparator":null,"unit":null,"notes":"","entity":{"slug":"iodine","display_name":"Iodine","entity_type_key":"nutrient_element"}},{"dimension":"organism","value_text":"Homo sapiens","comparator":null,"unit":null,"notes":"","entity":null},{"dimension":"plain_language","value_text":"The free T4 measurement also fell after selenium was added.","comparator":null,"unit":null,"notes":"","entity":null},{"dimension":"primary_references","value_text":"[iod-clin-contempre1992] Effect of selenium supplementation on thyroid hormone metabolism in an iodine and selenium deficient population. (1992). https://pubmed.ncbi.nlm.nih.gov/1424183/ DOI: 10.1111/j.1365-2265.1992.tb02268.x","comparator":null,"unit":null,"notes":"","entity":null},{"dimension":"tissue_or_cell_type","value_text":"Serum thyroid-hormone concentrations","comparator":null,"unit":null,"notes":"","entity":null},{"dimension":"trigger_kind","value_text":"nutrient_deficiency","comparator":null,"unit":null,"notes":"Imported condition classification; unverified.","entity":null}],"evidence":[{"id":"9b042755-3bc0-5a2f-b4c1-8ef90a77c604","evidence_kind":"source_excerpt","locator":"Lines 1272-1284","start_line":1272,"end_line":1284,"excerpt":"### iod-clin-selenium-free-t4\nMean serum free T4 fell from 11.8 ± 6.7 to 8.4 ± 4.1 pmol/L after selenium treatment (P<0.01).\nCondition category: nutrient_deficiency\nnutrient_topic: Iodine research collection; topical membership is not evidence of a direct dietary effect.\nplain_language: The free T4 measurement also fell after selenium was added.\norganism: Homo sapiens\ntissue_or_cell_type: Serum thyroid-hormone concentrations\nexperimental_model: Placebo-controlled selenium intervention in 52 schoolchildren from a region of severe iodine and selenium deficiency in northern Zaire\nlimitations: The abstract reports before/after changes in the selenium group; do not mistake these for adjusted between-group estimates. DIO1 restoration was a proposed explanation, not directly measured. Hormone changes do not themselves establish symptomatic deterioration or a universal order for supplement treatment.\nexposure: Selenium 50 micrograms/day as selenomethionine or placebo for two months; no concurrent iodine-repletion regimen reported in the abstract.\ncross_nutrient: true\nevidence_location: Primary indexed abstract.\n[iod-clin-contempre1992] Effect of selenium supplementation on thyroid hormone metabolism in an iodine and selenium deficient population. (1992). https://pubmed.ncbi.nlm.nih.gov/1424183/ DOI: 10.1111/j.1365-2265.1992.tb02268.x","model_system":"Placebo-controlled selenium intervention in 52 schoolchildren from a region of severe iodine and selenium deficiency in northern Zaire","directness":"author_interpretation","verification_status":"source_derived_draft","notes":"Exact curation-document quotation, not publisher quotation. Study references: [iod-clin-contempre1992] Effect of selenium supplementation on thyroid hormone metabolism in an iodine and selenium deficient population. (1992). https://pubmed.ncbi.nlm.nih.gov/1424183/ DOI: 10.1111/j.1365-2265.1992.tb02268.x","relationship":"supports","weight":1.0,"link_notes":"","source":{"id":"76da623d-a34a-5a5c-a942-d7571a85c486","stable_key":"import-aaa7baba-8689-56ab-ba1e-b71542bcb8e9","title":"Iodine: thyroid hormone production, deficiency, excess and nutrient interactions (2026-09-17)","document_type":"imported_text","citation_label":"AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text.","file_path":"","sha256":"a4885eb6f58bad4a4514c958b63834619e57b10aa7f694aa97d0f65c7d36548f","revision_id":"ea8001a1-b576-5eda-a193-883c7ad59b73","review_status":"unverified_draft","notes":""}}],"relations":[],"conflicts":[],"corrections":[],"research":null}